Title

Cross-stream migration of driven polymer solutions in nanoscale channels: A numerical study with generalized dissipative particle dynamics

Abstract

Polymer solutions in nanoscale slit pores and undergoing uniform pressure gradient (Poiseuille) flow are investigated via generalized dissipative particle dynamics simulations. In particular, the trend of cross-stream migration of the polymer chains during flow is investigated as a function of Schmidt number through varying the strength of the two-body dissipative and random forces in the dissipative particle dynamics formalism. For a given polymer solution, a migration away from the walls is observed as Schmidt number is increased. For a given Schmidt number, a migration away from the walls is also observed with increasing the driving force for relatively short chains. However, for long chains, a migration toward the walls is observed with increasing the driving force. We also analyzed the effects of channel thickness and temperature on the trend of the cross-stream migration of the polymer chains. © 2009 American Chemical Society.

Publication Title

Macromolecules

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